<template>
  <el-tooltip class="item" effect="dark" content="表格筛选" placement="top-start" style="marginRight: 10px">
    <el-dropdown :hide-on-click="false">
      <el-button icon="el-icon-s-tools"></el-button>
      <el-dropdown-menu slot="dropdown">
          <el-checkbox-group v-model="checkList" @change="checkChange">
            <el-dropdown-item v-for="item in dropList" :key="item.prop">
              <el-checkbox :disabled="checkDisabled(item.prop)" :label="item.prop" :value="item.prop">{{item.label}}</el-checkbox>
            </el-dropdown-item>
          </el-checkbox-group>
      </el-dropdown-menu>
    </el-dropdown>
  </el-tooltip>
</template>

<script>
  export default {
    props: {
      dropList: {
        type: Array,
        default: () => []
      }
    },
    data() {
      return {
        checkList: [],
      }
    },
    created() {
      this.initCheck()
    },
    methods: {
      // 只剩最后一项时禁用
      checkDisabled(val) {
        if (this.checkList.length === 1 && this.checkList.includes(val)) {
          return true
        }
        return false
      },
      // 初始化checklist
      initCheck() {
        let drop = this.dropList.map(item => item.prop)
        this.checkList = [...drop]
      },
      checkChange(val) {
        this.$emit('check-change', val)
      }
    },
  }
</script>

<style lang="scss" scoped>
.el-checkbox-group {
  display: flex;
  flex-direction: column;
}
::v-deep .el-dropdown-menu__item, .el-dropdown-menu:hover {
  background: #fff;
}
</style>